(2013·福建，28)Old－fashioned phones matter when wireless networks ________ in disasters.
A．turn downB．turn out
C．break downD．break out
D
考查動(dòng)詞短語(yǔ)辨析。A項(xiàng)“調(diào)小，拒絕”；B項(xiàng)“結(jié)果證明……”；C項(xiàng)“出故障，分解”；D項(xiàng)“爆發(fā)”。句意：當(dāng)發(fā)生災(zāi)難無(wú)線網(wǎng)絡(luò)無(wú)法用的時(shí)候，老式的電話就有作用了。故答案為C。
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